Quadrupolar and magnetic transitions in UPd 3

UPd 3 exhibits phase transitions at T 1 = 6.8K and T 2 = 4.4K, corresponding to antiferroquadrupolar and magnetic ordering. We have now confirmed a third transition at T 0 = 7.8K, where quadrupolar order first develops. The phase diagram for a magnetic field along the a-direction has been examined b...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 177; pp. 37 - 40
Main Authors McEwen, K.A., Steigenberger, U., Clausen, K.N., Kulda, J., Park, J.-G., Walker, M.B.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1998
Subjects
Magnetic structures
Phase transitions
Quadrupolar structures
Magnetic structures
Quadrupolar structures
Phase transitions
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Summary:UPd 3 exhibits phase transitions at T 1 = 6.8K and T 2 = 4.4K, corresponding to antiferroquadrupolar and magnetic ordering. We have now confirmed a third transition at T 0 = 7.8K, where quadrupolar order first develops. The phase diagram for a magnetic field along the a-direction has been examined by neutron-diffraction studies, using both polarised and unpolarised neutrons. In zero magnetic field, the intensities of the superlattice reflections due to the antiferroquadrupolar order are extremely weak. They increase rapidly in a magnetic field, and the underlying quadrupolar structure has been deduced from the induced magnetic structure. This method may be used to elucidate the quadrupolar structures of other systems.
ISSN:0304-8853
DOI:10.1016/S0304-8853(97)00993-1